Cancels an ongoing IME composition when receiving an IME_CANCEL_COMPOSITION e...

chrome/browser/ime_input.cc

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ime_input.h"
 
 #include "base/scoped_ptr.h"
 #include "base/string_util.h"
 
 // "imm32.lib" is required by IMM32 APIs used in this file.
 // NOTE(hbono): To comply with a comment from Darin, I have added
@@ skipping 285 matching lines @@
 void ImeInput::DisableIME(HWND window_handle) {
   // A renderer process have moved its input focus to a password input
   // when there is an ongoing composition, e.g. a user has clicked a
   // mouse button and selected a password input while composing a text.
   // For this case, we have to complete the ongoing composition and
   // clean up the resources attached to this object BEFORE DISABLING THE IME.
   CleanupComposition(window_handle);
   ::ImmAssociateContextEx(window_handle, NULL, 0);
 }
 
+void ImeInput::CancelIME(HWND window_handle) {
+  if (is_composing_) {
+    HIMC imm_context = ::ImmGetContext(window_handle);
+    if (imm_context) {
+      ::ImmNotifyIME(imm_context, NI_COMPOSITIONSTR, CPS_CANCEL, 0);
+      ::ImmReleaseContext(window_handle, imm_context);
+    }
+    ResetComposition(window_handle);
+  }
+}
+
 void ImeInput::EnableIME(HWND window_handle,
                          const gfx::Rect& caret_rect,
                          bool complete) {
   // Load the default IME context.
   // NOTE(hbono)
   //   IMM ignores this call if the IME context is loaded. Therefore, we do
   //   not have to check whether or not the IME context is loaded.
   ::ImmAssociateContextEx(window_handle, NULL, IACE_DEFAULT);
   // Complete the ongoing composition and move the IME windows.
   HIMC imm_context = ::ImmGetContext(window_handle);
@@ skipping 11 matching lines @@
     // This update is used for moving an IME window when a renderer process
     // resize/moves the input caret.
     if (caret_rect.x() >= 0 && caret_rect.y() >= 0) {
       caret_rect_.SetRect(caret_rect.x(), caret_rect.y(), caret_rect.width(),
                           caret_rect.height());
       MoveImeWindow(window_handle, imm_context);
     }
     ::ImmReleaseContext(window_handle, imm_context);
   }
 }